Question 42103
Translate the English words into mathematical symbols and operations.  The word "sum" means addition.  "A number" is the unknown number and can be represented by "x" or "n" or some other variable.  "More than" is to add to a number. "Times" means to multiply. Usually "is" means "equals".

6[x+)-15)] = 4x + 76
Simplify
6x-90 = 4x + 76
Solve for x
6x - 4x -90 = 4x -4x + 76
2x -90 = 76
2x -90 + 90 = 76 + 90
2x = 166
2x/2 = 166/2
X = 83

Check the answer by plugging x=83 back into the original equation.  Both sides of the equation should be equal.